Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Reexamination Certificate
2001-06-08
2003-08-05
Morris, Terrel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
C428S315500, C428S319300, C428S297400, C428S299700, C424S445000, C424S078060, C442S038000, C442S050000, C442S394000, C442S396000, C514S778000, C514S779000, C514S781000, C514S782000, C514S783000
Reexamination Certificate
active
06602592
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a moisture-retentive cooling get, a laminate thereof, and a moisture-retentive cooling plaster using such a gel or laminate.
2. Description of Related Art
Moisture-retentive cooling plasters have been known which include a support base and a gel layer such as of a water-soluble polymer provided on the support base. Such a moisture-retentive cooling plaster is superior in portability and adhesion, and used as a cooling medium for treatment of a feverish patient instead of an ice pack and an ice pillow.
The moisture-retentive cooling plaster, if its portability is an essential requirement, has a smaller water content because the size of the gel layer provided on the support base is limited. This leads to a shorter duration of moisture-retaining and cooling effects.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a moisture-retentive cooling gel, a laminate thereof, and a moisture-retentive cooling plaster, which offer moisture-retaining and cooling effects for a controlled duration and have superior functionality, e.g., capability of delivering and transporting an effective ingredient such as a pharmacological active ingredient or a perfume.
In accordance with a first aspect of the present invention, there is provided a moisture-retentive cooling gel which comprises: a water-retentive matrix of a water-soluble polymer having a water content of not lower than 40 wt %; and fibers dispersed in the water-retentive matrix, the fibers having a hydrophilic property at least at surfaces thereof, some of the fibers being exposed on a surface of the water-retentive matrix.
In accordance with a second aspect of the present invention, there is provided a moisture-retentive cooling gel laminate which comprises a plurality of layers of the aforesaid moisture-retentive cooling gel stacked one on another with a mesh sheet or a porous sheet interposed therebetween.
In accordance with a third aspect of the present invention, there is provided a moisture-retentive cooling plaster which comprises: an air-permeable support sheet; and the aforesaid moisture-retentive cooling gel or the aforesaid moisture-retentive cooling gel laminate provided on the support sheet.
The moisture-retentive cooling gel, the moisture-retentive cooling gel laminate and the moisture-retentive cooling plaster in accordance with the present invention each have a greater water content and a higher water vaporization rate and, therefore, sustainably offer superior effects when used as: (1) a medical cooling pad for cooling a part of a feverish human body; (2) a cooling package for fresh protection of fish, drinking water, liquor and the like in transportation thereof; (3) a cooling sheet for prevention of melting of chocolate in transportation thereof; (4) a pad for muscle cooling after sport and for skin care after sunburn; (5) a protective pad for water supply to a dry skin; and (6) a plaster containing an anti-inflammatory agent.
REFERENCES:
patent: 4913755 (1990-04-01), Grim
patent: 4964402 (1990-10-01), Grim et al.
patent: 5314456 (1994-05-01), Cohen
patent: 5388295 (1995-02-01), Sarkozi
patent: 5486206 (1996-01-01), Avery
patent: 6132455 (2000-10-01), Shang
patent: 6335088 (2002-01-01), Morikane et al.
Morikane Daizo
Morikane Shinji
Daiya Pharmaceutical Co., Ltd.
Vo Hai
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